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Futaba-RC JR AMERICAS Heli-Max
ckombo

Senior Heliman

Boston, MA USA

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Hi,

I want to increase my head speed from 1800 to 2000-2100 but i am still using my stock plast blade grips on my Raptor 50.

Some guys at the field say they are strong enough and even just as strong as metal while others say no way.

What is the real truth? DO i really have to dish out $100 on metal blade grips?

09-10-2011 Over year old.
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Heli 770

rrProfessor

Lemon Grove, CA.

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The Plastic grips are good for 2000rpm with C/f blades, I don't think 2100 would be pushing it. But, if your grips are old. I would change them out for new.

09-10-2011 Over year old.
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tintmaster

Veteran

Wichita, Ks. U.S.A.

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Stock plastic grips

I agree. You need to go with metal to be safe. You can always fine a good deal hear for a complete head or good used grips here on RR!

Just call me Farmer Brown. 'Cause I know how to really plant 'em

09-10-2011 Over year old.
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rfauske

Heliman

Førde, Norway

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I am running 2000-2100 on my pantera with no problems using 610mm carbon blades

Rasmus

09-10-2011 Over year old.
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MartyH

rrProfessor

USA

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Plastic grips are not as strong as metal. However, if you don't get carried away, 2000rpm should be fine on plastic. 2100 might be ok but any more than that and you need metal grips. This would be true on the Raptor you asked about as well as the Pantera.

09-16-2011 Over year old.
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Eleven_Bravo

Veteran

Salisbury,NC

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I ran 2000Hs on my Pantera for a whole flying season with no issues.

ENGAGE!!

03-04-2012 Over year old.
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wrongler

rrProfessor

Brewerton, New York

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Think safe, If you have doubts about plastic grips, spend the $$$.

Bill Whittaker

03-04-2012 Over year old.
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Eleven_Bravo

Veteran

Salisbury,NC

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I did not mean to bring an old thread back to life.

Think safe you are right I would like to add that I would never exceed 2000Hs with plastic grips. The Pantera is a very solid machine but there is no reason to push your luck.

ENGAGE!!

03-04-2012 Over year old.
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jbeech

Elite Veteran

Sanford, FL (Orlando area)

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Seeing as the fellow who started this thread posted a Raptor question within the Pantera forum - go back and read the post, which started this - I fail to see where it accomplishes anything to bring this thread back to life either.

That said, we have tested a Pantera to 2700 RPM without failure, which doesn't prove anything other than that Pantera withstood the test. However, it may be instructive to consider many folks routinely fly Panteras with 91-class engines, which easily produce significantly more horsepower than a 55-class engine.

Thus, I don't believe there is a reasonable cause for concern especially because unlike alunminum, which has a defined S-N curve limit, our engineering polymer grips have an indefinite Wöhler curve limit. E.g. no defined endurance limit due to cyclic fatigue - none whatsoever.

Moreover, unlike an aluminum grip, which may permanently deform under impact (leading the pilot to subsequently chase their tail trying to find the source of a vibration, our polymer grips either break on impact or return to their production shape (ready for more abuse). Hence, anyone who believes aluminum is the be all, end all in materials is deluding themselves about the state of materials art.

Our engineering polymers are called super plastics for a reason.


John Beech
AMA # 47381
IRCHA #745

03-04-2012 Over year old.
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MartyH

rrProfessor

USA

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As far as rote tensile strength, the metal grips typically seen on the high quality helis will definitely withstand higher headspeeds than plastic. Maybe John spun one to 2700rpm without it scattering but even he is not suggesting you a plastic grip at those speeds.

In academic theory the plastic is a better choice for general flying for some of the things John mentioned. The plastic either survives the crash or it doesn't and generally does not fatigue from use. Crash an aluminum head and you can spend your days and dollars chasing a tricky vibration because the metal distorted in all sorts of wierd directions.

03-15-2012 Over year old.
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